Efficiency at maximum power of a Carnot quantum information engine

TL;DR

This paper develops a generalized finite-time Carnot cycle for quantum information engines, deriving an efficiency formula at maximum power and analyzing the performance of a qubit engine under weak measurements.

Contribution

It introduces a new finite-time Carnot cycle model for quantum information engines and derives a universal efficiency formula at maximum power.

Findings

Derived a general efficiency at maximum power formula for quantum engines.

Optimized power output in low dissipation regime.

Analyzed performance of a qubit engine with weak energy measurements.

Abstract

Optimizing the performance of thermal machines is an essential task of thermodynamics. We here consider the optimization of information engines that convert information about the state of a system into work. We concretely introduce a generalized finite-time Carnot cycle for a quantum information engine and optimize its power output in the regime of low dissipation. We derive a general formula for its efficiency at maximum power valid for arbitrary working media. We further investigate the optimal performance of a qubit information engine subjected to weak energy measurements.